BlackRock finding its voice as an activist

For more independent commentary and analysis, visit www.breakingviews.comKEVIN ALLISONBUSINESS

BlackRock’s continuing experiment in governance activism has found a big target in Exxon Mobil, the oil giant. BlackRock, the manager of nearly $5 trillion worth of funds, withheld its support for two high-profile directors at Exxon’s annual meeting in...